DC-DC converter with HUGE input variation

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Hi all,

I am designing a DC-DC converter with huge input variation. My input is basicaly solar panels which generate fluctuating voltages and currents. My voltage varies from 0V(when there is no sun) to around 300V. With fluctuating input voltage, i want to have a fixed output voltage(150V or any voltage). What should i do? how should i design my DC-DC converter for this application?
Many thanks for those you read and reply this.

Tyler
 

What about a SEPIC converter or a combination of buck-boost converter? In both cases, the input voltage can be above,equal or below output voltage.
 


Hi! you can do this by the method of variable on time and variable frequency using a vco with error amp.
 

Hello,

The relative input voltage range for your converter is large, but the relative input range for operation of the converter is not large. Below a certain voltage the available power from your cells will be very low and operation of the converter is not required anymore. The output voltage at maximum power point versus light intensity doesn’t change much for solar cells. Selecting a convenient array voltage requires you to need a step-down converter only, avoiding the need for buck-boost topologies.

I would recommend you to understand solar cell basics and search on maximum power point tracking (MPPT). Sure you will find graphs of IV characteristics versus light intensity. Some info you can find in:
www.udc.edu/cere/Photovoltaic_Paper_ICREDC_Jan20.pdf
 

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